auto trans

I'm looking to install a TH700R4 in my CJ-7 '84 behind a 4.2L if you have or know of a trans for sale.. and if there is a "K" on the housing, that's a plus.. thanks.. wayne

When I am traveling at approx 50-60 mph on a slight incline, I notice that the AT can't seem to figure out what gear it wants to stay in. I can feel it step down and step up within seconds until I either reduce my speed or simply increase until I am over 60 MPH on the same incline. Is this sign...